Question
Which is a coordination compund?

Answer

Only 'Potassium ferrocyanide' $($i.e. $\ce{[Fe(CN)_5​])}$ shows properties of coordination compound.
When it gets dissolve they do not form simple ion like $\ce{Fe^{+2} or CN^−},$ but instead their complex ions remain intact.
whereas carnallite $($i.e. $\ce{KMgCl_3​ )}$,
Gypsum $($i.e. $\ce{CaSO_4​)}$ and Ferrous ammonium sulphate $($i.e. $\ce{(NH_4​)_{2​}Fe(SO_{4​})_{2​})}$ they dissovle and give simple ions.

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